A core competency facilitates the identification of training needs and guides the design of a
professional development program. Thus, this research was to explore and examine the core competencies in
vocational welder worker based on Thai welding industry participator perceptions. To synthesize core
competencies first used the focus group technique with 17 experts to identify their perspectives on core
competencies in vocational welder worker. After that competencies questionnaire survey was developed to
collect data from a participator sample consist of , 206 welding industry participators. Research methods were
applied to collect quantitative data using questionnaires, forms, interviews, discussion groups and workshops.
The resulting analysis revealed that the main elements of the competencies in vocational welder worker could
be divided into three core competencies categories, namely: 1) The knowledge and skills generally: Basic skills
and Information technology skills 2) The knowledge and skills specific: Process of connection and control,
Welding process design, Metal structuring, The selection of proper welding process, Welding control,
Inspection and testing process piece, Drawing and design product, Handmade sheet metal product, Produce and
control manufacturing, and Pipe installation 3) The attitude: Personalities and human relation.